Oxford Brookes University Updated 2025-07-16
Their only undergraduate courses that matter:
United States diplomatic cables leak Updated 2025-07-16
University of Edinburgh Updated 2025-07-16
Cocaine Updated 2025-07-16
Derivation of the quantum electrodynamics Lagrangian Updated 2025-07-16
Like the rest of the Standard Model Lagrangian, this can be split into two parts:
- spacetime symmetry: reaches the derivation of the Dirac equation, but has no interactions
- add the internal symmetry to add interactions, which reaches the full equation
Deriving the qED Lagrangian by Dietterich Labs (2018)
Source. As mentioned at the start of the video, he starts with the Dirac equation Lagrangian derived in a previous video. It has nothing to do with electromagnetism specifically.
He notes that that Dirac Lagrangian, besides being globally Lorentz invariant, it also also has a global invariance.
However, it does not have a local invariance if the transformation depends on the point in spacetime.
He doesn't mention it, but I think this is highly desirable, because in general local symmetries of the Lagrangian imply conserved currents, and in this case we want conservation of charges.
To fix that, he adds an extra gauge field (a field of matrices) to the regular derivative, and the resulting derivative has a fancy name: the covariant derivative.
Then finally he notes that this gauge field he had to add has to transform exactly like the electromagnetic four-potential!
So he uses that as the gauge, and also adds in the Maxwell Lagrangian in the same go. It is kind of a guess, but it is a natural guess, and it turns out to be correct.
Derivative test Updated 2025-07-16
Gmail Updated 2025-07-16
University of Oxford Updated 2025-07-16
WordNet Updated 2025-07-16
Groups concepts by hyponymy and hypernymy and meronymy and holonymy. That actually makes a lot of sense! TODO: is there a clear separation between hyponymy and meronymy?
Browse: wordnetweb.princeton.edu/perl/webwn Appears dead as of 2025 lol.
The online version of WordNet has been deprecated and is no longer available.
Does not contain intermediat scientific terms, only very common ones, e.g. no mention, of "Josephson effect", "photoelectric effect"
Bernstein-Vazirani algorithm Updated 2025-07-16
Devboard battery power Updated 2025-07-16
Many devborads require a 5V power supply.
For battery power you need a transformer.
Raspberry Pi Battery Power by ExplainingComputers (2021)
Source. Grover's algorithm Updated 2025-07-16
Guerrilla Mail Updated 2025-07-16
Jami (software) Updated 2025-07-16
Ciro Santilli worked on it for a brief time in 2016, when it was still called Ring, before he got fired. :-)
The people were quite nice and the project idea is fine, Ciro hopes they succeed.
Ring - Peer to peer network for real time communication - FOSDEM 2016 by Ciro Santilli
. Source. Microsoft Outlook Updated 2025-07-16
Skype Updated 2025-07-16
Dialog between Fisherman and Woodcutter Updated 2025-07-16
Lit: fish timber question answer.
The dialog is also known as allegory for an incredibly deep philosophical discussion between an idealized wise woodcutter and a fisherman, e.g. mentioned at: www2.kenyon.edu/Depts/Religion/Fac/Adler/Writings/Fisherman%20and%20Woodcutter.pdf
This song is just too slow for Ciro Santilli to make much out of it.
Bibliography:
Dialog between Fisherman and Woodcutter Chinese traditional painting by Xie Shichen
. Diffie-Hellman vs ECDH Updated 2025-07-16
ECDH has smaller keys. youtu.be/gAtBM06xwaw?t=634 mentions some interesting downsides:
JT-60 Updated 2025-07-16
Zen Updated 2025-07-16
There are unlisted articles, also show them or only show them.